Channel NewsAsia's award-winning investigative series returns for a fourth season as we go undercover to expose the secret underbelly of Asia. Through in-depth, hard-hitting documentaries, we explore stories of crime, violence and injustice. This season, we track down mistress busters in China, expose a gang of vigilantes out to bust the drug trade in Myanmar and investigate an epidemic of elderly deaths in Japan. Find out the untold stories lurking within the hidden fabric of our own societies.